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Method for quantitatively calibrating and eliminating crosstalk of SQUID (Superconducting Quantum Interference Device) planar three-shaft magnetometer

A calibration method, three-axis magnetic technology, applied in the direction of the magnitude/direction of the magnetic field, the use of superconducting devices for magnetic field measurement, measuring devices, etc., can solve problems that cannot be eliminated, crosstalk between three magnetometers, etc.

Active Publication Date: 2013-01-09
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Since the bare SQUID device has no superconducting shield, there is mutual inductance between the feedback coil and each SQUID ring, resulting in crosstalk between the three magnetometers
Reducing the diameter of the SQUID feedback coil and increasing the space distance between SQUIDs can reduce the influence of crosstalk to a certain extent, but cannot eliminate it, so it is urgent to explore the quantitative evaluation and elimination methods of triaxial crosstalk

Method used

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  • Method for quantitatively calibrating and eliminating crosstalk of SQUID (Superconducting Quantum Interference Device) planar three-shaft magnetometer
  • Method for quantitatively calibrating and eliminating crosstalk of SQUID (Superconducting Quantum Interference Device) planar three-shaft magnetometer
  • Method for quantitatively calibrating and eliminating crosstalk of SQUID (Superconducting Quantum Interference Device) planar three-shaft magnetometer

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Embodiment Construction

[0041] 1. Use double-sided adhesive tape to stick three SQUID devices (1) on the three mutually perpendicular planes of the epoxy cube (3) to build a three-axis magnetometer. The entire device, leads and interfaces are integrated in one on a test rod;

[0042] 2. Place the test rod in a low-temperature Dewar, and the three-axis magnetometer works at the temperature of liquid helium. First, test the internal mutual inductance M of each single magnetometer feedback coil (2) and SQUID ring (1) i , use the signal generator to input a certain intensity low frequency test signal V into the feedback coil f , adjust the parameters of the readout circuit, so that the flux-locked loop FLL works at the best working point of the unlocked state, adjust the intensity of the input signal of the feedback coil (2), and make the FLL output signal connect up and down symmetrically. At this time, the SQUID detection The magnetic flux is a flux quantum Φ 0 , lock the FLL, and record the output s...

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Abstract

The invention relates to a method for quantitatively calibrating and eliminating the crosstalk of a SQUID (Superconducting Quantum Interference Device) planar three-shaft magnetometer, which is characterized by testing the mutual inductance between a feedback coil and an SQUID adjacent to the feedback coil to quantitatively calibrate the crosstalk when the crosstalk of the planar three-shaft magnetometer exists between the feedback coil and the SQUID, thereby eliminating the crosstalk on the basis. The method comprises the following steps of: (1) preparing the SQUID planar three-shaft magnetometer; (2) quantitatively calibrating three-shaft crosstalk; and (3) analyzing and eliminating the crosstalk. The method is characterized in that the three-shaft magnetometer comprising a planar nakedSQUID is used for replacing the traditional wire-wound magnetometer, and the mutual inductance is used as an index for calibrating the size of the crosstalk so that the crosstalk is eliminated. The method has the advantages that the SQUID planar magnetometer has high integration level so that the magnetic flux interference caused by line transmission is avoided, and the calibration and the elimination of the crosstalk ensure the optimized use of the SQUID planar magnetometer.

Description

technical field [0001] The invention relates to a method for quantitatively calibrating and eliminating crosstalk of a SQUID plane three-axis magnetometer. Background technique [0002] Superconducting quantum interference device (Superconducting Quantum Interference Device, SQUID) is currently known as the most sensitive magnetic flux sensor, widely used in the detection of weak biomagnetic signals [V.Pizzela et al, Supercond.Sci.Technol.14(2001 )R79-R114]. [0003] Weak magnetic signal and strong environmental magnetic field are the problems that SQUID biomagnetic detection must face. In order to suppress the environmental magnetic field, the gradiometer technique is one of the most commonly used methods, which can well suppress far-field noise and detect near-biological magnetic signals. The response of an ideal gradiometer to a uniform magnetic field is zero. Due to mechanical and manufacturing precision in the winding process, the gradiometer inevitably has unbalance ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/00G01R33/035
Inventor 王永良刘扬波张树林谢晓明
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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